Abstract
Purpose: :
The pattern scan laser is a semiautomated photocoagulator that delivers a pattern array of multiple burns in a rapid predetermined sequence. Several studies already reported that the pattern scan green (532 nm) laser system had comparable efficacy to historical results with conventional retinal photocoagulation and been performed quicker with less discomfort for patients. Recently, not only green wavelength (532 nm) but also yellow wavelength (577 nm) became available with the pattern scan laser system. The purpose of this study is to evaluate the efficacy and safety of the pattern scan yellow laser.
Methods: :
We conducted a retrospective chart review of 25 patients (27 eyes) who underwent laser photocoagulation with the pattern scan yellow laser (PASCAL Streamline 577, Topcon, Tokyo). These 27 eyes were divided into two groups; group P eyes underwent panretinal photocoagulation and group G eyes underwent macular grid and/or focal laser. Outcomes measured included best-corrected visual acuity (BCVA), central retinal thickness (CRT), the laser settings parameters and visual analog scale (VAS) for pain perception. As for the laser settings parameters, we compared with the data of the pattern scan green laser (PASCAL Streamline, Topcon)(58 eyes for group P, 8 eyes for group G)
Results: :
Nineteen eyes in group P and 8 eyes in group G had been evaluated. For PRP, the average power was 348 mW (275-475 mW), and it was significantly lower power than that with the pattern scan green laser (average 433 mW, p< 0.0001). For grid and/or focal laser photocoagulation, the average power was 107 mW (70-275 mW), and it was also significantly lower than the pattern scan green laser (260 mW, p< 0.001). In group G, the VAS was average 2.5 and it was similar to that with the pattern scan green laser, and significantly lower than that with conventional laser1). There was no case developed macular edema worsening in CRT or significant reduction in BCVA.
Conclusions: :
From our results, the pattern scan yellow laser required less power than the pattern scan green laser. And the pain level was similar to the pattern scan green laser and significantly lower than conventional laser. Collectively, the pattern scan yellow laser may be beneficial for laser treatment with less power and less pain.1) Al-Hussainy S et al: Eye 22:96-99, 2008
Keywords: laser • diabetic retinopathy • retina